Tablets aren’t the most powerful computing gadgets. But they are the most convenient.

They’re bigger than the tiny screen of a smartphone, even the big ones sporting nearly 5-inch screens.

They have longer battery life and always-on capabilities better than any PC — and will continue to be better at that than any ultrathin/book/Air laptop. That makes them very handy for carrying around and using frequently, casually, and intermittently even where there isn’t a flat surface or a chair on which to use a laptop.

And tablets are very good for information consumption, an activity that many of us do a lot of. Content creation apps are appearing on tablets. They’ll get a lot better as developers get used to building for touch-first interfaces, taking advantage of voice input, and adding motion gestures.

They’re even better for sharing and working in groups. There’s no barrier of a vertical screen, no distracting keyboard clatter, and it just feels natural to pass over a tablet, like a piece of paper, compared to spinning around a laptop.

Wearable devices, or “wearables” for short, have enormous potential for uses in health and fitness, navigation, social networking, commerce, and media. Imagine video games that happen in real space. Or glasses that remind you of your colleague’s name that you really should know. Or paying for a coffee at Starbucks with your watch instead of your phone. Wearables will transform our lives in numerous ways, trivial and substantial, that we are just starting to imagine.

In a new Forrester report out today, we argue that wearables will move mainstream once they get serious investment from the “big five” platforms — Apple, Google, Microsoft, Amazon, and Facebook — and their developer communities, and we give advice to product strategists who want to stay ahead of the wearables curve. Key takeaways: